The current build of Firefox 24 for OS/2 is the first build that contains a lot of fixes since the release of Firefox 17 ESR Beta 2. In first place it addresses the FPU exception handling problem. The debug test build download is on netlabs (200MB). Because of the compiler change the new GCC 4.7.3 runtime dlls are required: gcc runtime.
Update 05/28/2014 : a refreshed non debug build is now available: download (33MB)